I am wary of all non prescribed medication interfering with the warfarin I take. However, I have a head cold and don't know if I should ignore it or take something. Advice please. Incidentally, I am also on penicillin for an abscess.

Thanks. As luck would have it I finish the penicillin on Monday next and have a pre-booked INR on Wednesday. So a careful check on Vitamin K intake and I should be ok. In any case my head cold is feeling a lot better.